Method and apparatus for spinal fixation

• US 6,613,050 B1
• Filed: 11/04/1999
• Issued: 09/02/2003
• Est. Priority Date: 10/24/1996
• Status: Expired due to Fees

• Current Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Spinal Concepts Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Jones, Robert J., Wagner, Erik J., Jannetty, Vincent J.
• Primary Examiner(s): Woo, Julian W.
• Application Number:
  US09/434,324
• Time in Patent Office: 1,398 Days
• Field of Search: 606/53, 606/61, 606/72, 606/73, 606/54, 623/17.11
• US Class Current: 606/250
• CPC Class Codes: A61B 17/7002 Longitudinal elements, e.g. rods
• CPC Class Codes: A61B 17/7011 Longitudinal element being non-straight, e.g. curved, angled or branched adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 17/7038 to a different extent in different directions, e.g. within one plane only
• CPC Class Codes: A61B 17/7041 with single longitudinal rod offset laterally from single row of screws or hooks A61B17/7044 takes precedence
• CPC Class Codes: A61B 17/7049 Connectors, not bearing on the vertebrae, for linking longitudinal elements together A61B17/7055, A61B17/7053, A61B17/7019 take precedence
• CPC Class Codes: A61B 2017/00858 high friction, non-slip on handles A61B2017/00429

Abstract

A spinal fixation implant system for correction and fixation of the human spine to facilitate an anatomically correct fusion. The spinal fixation system may include a connector, a spinal rod, a spinal fixation component, a sleeve, and a fastener. The spinal fixation component preferably includes a fixation device such as a hook or screw for securing the spinal rod to vertebrae of the thoracic or lumbar spine. The spinal fixation component preferably includes a threaded end on its top that is adapted to receive the fastener. The fixation component may include a body having a tapered cavity for engaging the receiving end of the connector. Tightening of the fastener preferably downwardly translates the sleeve over the fixation component body to force the connector through the tapered cavity, which compresses the receiving end about the spinal rod to fixably connect the spinal rod and the spinal fixation component. In an alternate embodiment, assembly pliers may be used to move the connector into the tapered cavity. The fixation component may also include a rotatable fixation member. The spinal rod and connector may include a textured surface to inhibit movement of the connector with respect to the spinal rod. The fastener may be a clip configured to engage an indentation formed in the connector to secure the connector within the fixation component. The connector may include a tab which is configured to interact with a channel formed in the cavity to inhibit the removal of the connector from the cavity.

Claims

1. A connector for connecting spinal fixation components to a spinal rod, comprising:

a lower section, the lower section comprising a first arm and a second arm that form an opening for receiving the spinal rod, and wherein portions of surfaces of the first arm and the second arm that define the opening comprise non-threaded, textured surfaces configured to have large coefficients of friction with respect to the spinal rod;

an upper section, the upper section defining a slot communicating with the opening in the lower section, wherein the slot terminates in an enlarged opening in the upper section; and

wherein the arms are deflectable to cause widening of a portion of the slot and widening of a width of the opening to allow the spinal rod to be placed into the opening, and wherein the arms are deflectable to cause narrowing of a portion of the slot and narrowing of the width of the opening to allow for frictional engagement of the spinal rod by the non-threaded, textured surfaces of the first arm and second arm during use to inhibit movement of the connector with respect to the spinal rod.

2. The connector as defined in claim 1, further comprising at least one indentation in the upper section configured to attach the connector to a fixation component.

3. The connector as defined in claim 1, further comprising threading on the upper section configured to attach the connector to a fixation component.

4. The connector as defined in claim 1, further comprising a fastener configured to couple the connector to a fixation component during use.

5. The connector as defined in claim 1, the width of the opening before the arms are deflected is less than a diameter of the spinal rod.

6. The connector as defined in claim 1, wherein the non-threaded, textured surfaces are configured to contact a portion of the spinal rod during use, and wherein the non-threaded, textured surfaces are configured to inhibit motion of the spinal rod during use.

7. The connector as defined in claim 1, wherein the connector further comprises a pair of tapered sides, and wherein a width between the sides is greatest near the opening and least near a top of the upper section.

8. The connector as defined in claim 7, wherein a portion of outer surfaces of the pair of sides comprise texturing.

9. The connector as defined in claim 8, wherein the textured outer surfaces are prepared by forming a plurality of grooves in the surfaces.

10. The connector as defined in claim 8, wherein the textured outer surfaces are prepared by a shot peening process.

11. The connector as defined in claim 8, wherein the textured outer surfaces are prepared by an electric discharge process.

12. The connector as defined in claim 1, wherein outer surfaces of the first and second arms taper, wherein a width between the first arm and the second arm is greatest near the opening and least near a bottom of the upper section, and wherein the upper section comprises a protrusion configured to fit within a cavity of a fixation component.

13. The connector as defined in claim 1, wherein the non-threaded, textured surfaces are prepared by forming a plurality of grooves in the opening.

14. The connector as defined in claim 1, wherein the non-threaded, textured surfaces are prepared by a shot peening process.

15. The connector as defined in claim 1, wherein the non-threaded, textured surfaces are prepared by an electric discharge process.

16. The connector as defined in claim 1, further comprising a spacer configured to fit between the lower section and a fixation component during use.

17. The connector as defined in claim 16, wherein the fixation component further comprises a fixation device, wherein the fixation device comprises protrusions, and wherein the spacer further comprises teeth configured to form a complementary engagement with the protrusions to inhibit rotation of the fixation device about the spacer during use.

18. The connector as defined in claim 1, further comprising a fixation component having a cavity, wherein a portion of the lower section fits within the cavity.

19. The connector as defined in claim 18, wherein walls of the fixation component that form the cavity are configured to compress the first arm and the second arm to secure the fixation component to the connector and the connector to the spinal rod during use.

20. The connector as defined in claim 18, wherein a portion of outer surfaces of walls that form the cavity are textured.

21. The connector as defined in claim 18, wherein the fixation component further comprises a hole, and further comprising a locking element configured to extend through the hole and contact the connector to inhibit movement of the connector within the cavity during use.

22. The connector as defined in claim 21, further comprising at least one indentation in the upper section, wherein the locking element engages the at least one indentation during use.

23. The connector as defined in claim 18, wherein the fixation component further comprises a fixation device for attaching the spinal rod to a vertebra.

24. The connector as defined in claim 18, wherein the fixation component comprises a top section and a bottom section, wherein the top section and the bottom section each comprise at least one curved edge, and wherein the fixation component is configured to pivot about the spinal rod in a substantially vertical plane during use, and wherein curved edges of the top section and the bottom section are configured to contact the spinal rod during pivoting of the fixation component to define a range of pivotal motion of the fixation component during use.

25. The connector as defined in claim 18, wherein the fixation component further comprises a transverse connector for coupling the spinal rod to a neighboring spinal rod.

26. The connector as defined in claim 18, wherein the fixation component further comprises a fixation device, the fixation device comprising a head, wherein the head is configured to be positionable within the cavity so that the fixation device is rotatable about a longitudinal axis of the spinal rod during use, and wherein a surface of the head is substantially textured so that the textured surface of the head interacts with an outer surface of the connector to inhibit rotation of the fixation device during use.

27. A connector for attaching spinal fixation components to a spinal rod, comprising:

an upper section;

a first arm extending from the upper section, the first arm comprising a non-threaded, textured surface configured to frictionally engage an outer surface of the spinal rod;

a second arm extending from the upper section, the second arm comprising a surface configured to engage the outer surface of the spinal rod;

a slot in the upper section between the first arm and second arm, the slot extending to a bottom of the upper section and terminating in an enlarged opening in the bottom of the upper section; and

an opening between the surface of the first arm and the surface of the second arm, the opening configured to receive the spinal rod, wherein the first arm and second arm are deflectable to cause the slot to narrow, which fixes the spinal rod within the opening during use.

28. The connector as defined in claim 27, further comprising at least one indentation in the upper section configured to attach the connector to a fixation component.

29. The connector as defined in claim 27, further comprising threading on the upper section configured to attach the connector to a fixation component.

30. The connector as defined in claim 27, further comprising a fastener configured to couple the connector to a fixation component during use.

31. The connector as defined in claim 27, wherein the width of the opening before the arms are deflected is less than a diameter of the spinal rod.

32. The connector as defined in claim 27, wherein the connector further comprises a pair of tapered sides, and wherein a width between the sides is greatest near the opening and least near a top of the upper section.

33. The connector as defined in claim 32, wherein a portion of outer surfaces of the pair of tapered sides comprise texturing.

34. The connector as defined in claim 33, wherein the textured outer surfaces are prepared by forming a plurality of grooves in the surfaces.

35. The connector as defined in claim 33, wherein the textured outer surfaces are prepared by a shot peening process.

36. The connector as defined in claim 33, wherein the textured outer surfaces are prepared by an electric discharge process.

37. The connector as defined in claim 27, wherein outer surfaces of the first and second arms taper, wherein a width between the first arm and the second arm is greatest near the opening and least near a bottom of the upper section, and wherein the upper section comprises a protrusion configured to fit within a cavity of a fixation component.

38. The connector as defined in claim 27, the textured surface is prepared by forming a plurality of grooves in the opening.

39. The connector as defined in claim 27, wherein the textured surface is prepared by a shot peening process.

40. The connector as defined in claim 27, wherein the textured surface is prepared by an electric discharge process.

41. The connector as defined in claim 27, further comprising a spacer configured to fit between the upper section and a fixation component during use.

42. The connector as defined in claim 35, wherein the fixation component further comprises a fixation device, wherein the fixation device comprises protrusions, and wherein the spacer further comprises teeth configured to form a complementary engagement with the protrusions to inhibit rotation of the fixation device about the spacer during use.

43. The connector as defined in claim 27, further comprising a fixation component having a cavity, wherein a portion of the upper section fits within the cavity.

44. The connector as defined in claim 43, wherein walls of the fixation component that form the cavity are configured to compress the arms of the connector to secure the fixation component to the connector and the connector to the spinal rod during use.

45. The connector as defined in claim 43, wherein a portion of outer surfaces of walls that form the cavity are textured.

46. The connector as defined in claim 43, wherein the fixation component further comprises a hole, and further comprising a locking element configured to extend through the hole and contact the connector to inhibit movement of the connector within the cavity during use.

47. The connector as defined in claim 46, further comprising at least one indentation in the upper section, wherein the locking element engages the at least one indentation during use.

48. The connector as defined in claim 43, wherein the fixation component further comprises a fixation device for attaching the spinal rod to a vertebra.

49. The connector as defined in claim 43, wherein the fixation component comprises a top section and a bottom section, wherein the top section and the bottom section each comprise at least one curved edge, and wherein the fixation component is configured to pivot about the spinal rod in a substantially vertical plane during use, and wherein curved edges of the top section and the bottom section are configured to contact the spinal rod during pivoting of the fixation component to define a range of pivotal motion of the fixation component during use.

50. The connector as defined in claim 43, wherein the fixation component further comprises a transverse connector for attaching the spinal rod to a neighboring spinal rod.

51. The connector as defined in claim 43, wherein the fixation component further comprises a fixation device, the fixation device comprising a head, wherein the head is configured to be positionable within the cavity so that the fixation device is rotatable about a longitudinal axis of the spinal rod during use, and wherein a surface of the head is substantially textured so that the textured surface of the head interacts with an outer surface of the connector to inhibit rotation of the fixation device during use.

52. A connector for attaching spinal fixation components to a spinal rod, comprising:

a body;

an opening through the body defining a surface;

non-threaded texturing on a portion of the surface that forms a non-threaded textured surface, the non-threaded textured surface configured to frictionally engage a spinal rod during use to inhibit movement of the spinal rod relative to the body; and

a longitudinal slot in the body, wherein a first end of the slot is in communication with the opening through the body and a second end of the slot terminates in an enlarged second opening, wherein narrowing the slot fixes a spinal rod positioned within the opening to the connector, and wherein widening the slot allows the spinal rod positioned within the opening to be removed from the opening.

53. The connector as defined in claim 52, wherein the textured surface is prepared by forming a plurality of grooves in the surface.

54. The connector as defined in claim 52, wherein the textured surface is prepared by a shot peening process.

55. The connector as defined in claim 52, wherein the textured surface is prepared by an electric discharge process.

56. The connector as defined in claim 52, further comprising at least one indentation in the body configured to attach the connector to a fixation component.

57. The connector as defined in claim 52, further comprising threading on a portion of the body, the threading configured to attach the connector to a fixation component.

58. The connector as defined in claim 52, further comprising a fastener configured to couple the connector to a fixation component during use.

59. The connector as defined in claim 52, wherein the portion of the outer surface of the spinal rod comprises a textured surface.

60. The connector as defined in claim 52, wherein the body further comprises a pair of tapered sides, and wherein a width between the sides is greatest near the top of the body and least near the bottom of the body.

61. The connector as defined in claim 60, wherein a portion of outer surfaces of the pair of tapered sides comprise texturing.

62. The connector as defined in claim 61, wherein the textured outer surfaces are prepared by forming a plurality of grooves in the surfaces.

63. The connector as defined in claim 61, wherein the textured outer surfaces are prepared by a shot peening process.

64. The connector as defined in claim 61, wherein the textured outer surfaces are prepared by an electric discharge process.

65. The connector as defined in claim 52, wherein outer surfaces of the body taper, wherein a width between outer surfaces of the body is greatest near the top of the body and least near the bottom of the body, and wherein a portion of the body is configured to fit within a cavity of a fixation component.

66. The connector as defined in claim 52, further comprising a spacer configured to fit between the opening and a fixation component during use.

67. The connector as defined in claim 66, wherein the fixation component further comprises a fixation device, wherein the fixation device comprises protrusions, and wherein the spacer further comprises teeth configured to form a complementary engagement with the protrusions to inhibit rotation of the fixation device about the spacer during use.

68. The connector as defined in claim 52, further comprising a fixation component having a cavity, wherein a portion of the body fits within the cavity.

69. The connector as defined in claim 68, wherein walls of the fixation component that form the cavity are configured to compress the arms of the connector to secure the fixation component to the connector and the connector to the spinal rod during use.

70. The connector as defined in claim 68, wherein a portion of outer surfaces of walls that form the cavity are textured.

71. The connector as defined in claim 68, wherein the fixation component further comprises a hole, and further comprising a locking element configured to extend through the hole and contact the connector to inhibit movement of the connector within the cavity during use.

72. The connector as defined in claim 71, further comprising at least one indentation in the body, wherein the locking element engages the at least one indentation during use.

73. The connector as defined in claim 68, wherein the fixation component further comprises a fixation device for attaching the spinal rod to a vertebra.

74. The connector as defined in claim 68, wherein the fixation component comprises a top section and a bottom section, wherein the top section and the bottom section each comprise at least one curved edge, and wherein the fixation component is configured to pivot about the spinal rod in a substantially vertical plane during use, and wherein curved edges of the top section and the bottom section are configured to contact the spinal rod during pivoting of the fixation component to define a range of pivotal motion of the fixation component during use.

75. The connector as defined in claim 68, wherein the fixation component further comprises a transverse connector for coupling the spinal rod to a neighboring spinal rod.

76. The connector as defined in claim 68, wherein the fixation component further comprises a fixation device, the fixation device comprising a head, wherein the head is configured to be positionable within the cavity so that the fixation device is rotatable about a longitudinal axis of the spinal rod during use, and wherein a surface of the head is substantially textured so that the textured surface of the head interacts with an outer surface of the connector to inhibit rotation of the fixation device during use.

77. A connector for attaching spinal fixation components to a spinal rod, comprising:

a body;

an opening through the body defining a surface;

texturing on a portion of the surface that forms a textured surface, the textured surface configured to frictionally engage a spinal rod during use to inhibit movement of the spinal rod relative to the body;

a longitudinal slot in the body in communication with the opening, wherein narrowing the slot fixes a spinal rod positioned within the opening to the connector, and wherein widening the slot allows the spinal rod positioned within the opening to be removed from the opening;

a pair of tapered sides, wherein at least a portion of outer surfaces of the pair of sides comprises texturing; and

at least one indentation in the body configured to accept a clip that couples the connector to a fixation component.

78. The connector as defined in claim 77, further comprising a spacer configured to fit between the opening, and a fixation component during use.

79. The connector as defined in claim 77, further comprising a fixation component having a cavity, wherein a portion of the body fits within the cavity.